Konpon-ji, Nichiren Buddhist head temple in Sado, Japan

Konpon-ji is a Nichiren Buddhist head temple on Mount Tsukahara in Shino-Ono, Sado. Its main hall was built in 1672, the founder's hall in 1761 and the kitchen building in 1679. The temple is reached on foot in about three minutes from the Konpon-ji-mae bus stop on Prefectural Route 65.

According to temple tradition, Nichiren founded a sanmai-dō here in 1271 during his exile on Sado. In the Eiroku era Nisshō converted that hall into Shōkyō-ji; in 1587 Niken of Kyoto's Myōkaku-ji established Konpon-ji as its branch temple. In 1615 Nien made it an independent head temple, and from 1671 it served as a rotation residence for the temples of Minobu, Ikegami and Nakayama.

The temple's name comes from the Nichiren-shū headquarters it became in 1615, when Nichiren's hermitage was elevated in rank. The site is a reijō, a sacred trace of the founder, and the Sannō shrine next door is a separate Shintō site. The hall where Nichiren is said to have opened a zanmai-dō in 1271 is the temple's origin point.

The site is open from 8:00 AM to 4:30 PM from April through October, and from 8:00 AM to 3:30 PM the rest of the year. Comfortable walking shoes are recommended since the grounds are extensive and require time to explore.

The temple's founder, Nichiren, is said by temple tradition to have opened a Sanmai-dō here in 1271, during his exile on Sado. The hall later became Shōkyō-ji before the Konpon-ji name was established in 1587. The Main Hall standing today was built in 1672.